.engineering-page {
  min-height: 100vh;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 86% 8%, rgba(126, 211, 33, 0.1), transparent 22%),
    linear-gradient(180deg, #f3f7f8 0%, #fbfcfb 58%, #f5f8f5 100%);
}

.engineering-page .site-header {
  position: sticky;
  top: 0;
  z-index: 50;
}

.engineering-lang {
  display: flex;
  gap: 6px;
}

.engineering-lang button {
  min-width: 42px;
  min-height: 36px;
  color: rgba(255, 255, 255, 0.72);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 7px;
  cursor: pointer;
  font-weight: 900;
}

.engineering-lang button.is-active {
  color: #071014;
  background: var(--green);
  border-color: var(--green);
}

.engineering-page-main {
  padding: 24px 0 74px;
}

.engineering-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  margin-bottom: 20px;
  color: rgba(15, 23, 32, 0.6);
  font-size: 0.84rem;
}

.engineering-breadcrumb a:hover {
  color: var(--green-2);
}

.library-layout {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.library-sidebar {
  position: sticky;
  top: 106px;
  min-width: 0;
  padding-right: 24px;
  border-right: 1px solid rgba(15, 23, 32, 0.1);
}

.library-sidebar > h2 {
  margin: 0 0 14px;
  color: #111820;
  font-size: 0.97rem;
}

.library-category-nav {
  display: grid;
  gap: 6px;
  width: 100%;
  max-width: 100%;
}

.library-nav-link {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 9px;
  align-items: center;
  min-height: 44px;
  padding: 9px 12px;
  color: rgba(15, 23, 32, 0.78);
  border: 1px solid transparent;
  border-radius: 7px;
  font-size: 0.9rem;
  font-weight: 750;
  transition: color 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

.library-nav-link span {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  color: #489e0d;
  border: 1px solid rgba(72, 158, 13, 0.22);
  border-radius: 7px;
}

.library-nav-link:hover,
.library-nav-link.is-active {
  color: #286e06;
  background: linear-gradient(135deg, rgba(153, 239, 77, 0.24), rgba(126, 211, 33, 0.12));
  border-color: rgba(126, 211, 33, 0.28);
}

.library-filter-panel {
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid rgba(15, 23, 32, 0.1);
}

.library-filter-panel h3 {
  margin: 0 0 14px;
  font-size: 0.94rem;
}

.library-filter-list {
  display: grid;
  gap: 11px;
}

.library-filter-option {
  display: flex;
  gap: 9px;
  align-items: center;
  color: rgba(15, 23, 32, 0.72);
  cursor: pointer;
  font-size: 0.88rem;
}

.library-filter-option input {
  width: 17px;
  height: 17px;
  accent-color: var(--green-2);
}

.library-clear-filters {
  margin-top: 16px;
  padding: 0;
  color: #428d0d;
  background: none;
  border: 0;
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 850;
}

.library-content {
  min-width: 0;
}

.library-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(250px, 340px);
  gap: 28px;
  align-items: end;
  margin-bottom: 26px;
}

.library-hero h1 {
  margin: 0;
  color: #0a1118;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1;
}

.library-hero h1::after {
  content: "";
  display: block;
  width: 40px;
  height: 3px;
  margin-top: 13px;
  border-radius: 99px;
  background: var(--green);
}

.library-hero p:not(.section-kicker) {
  max-width: 760px;
  margin: 14px 0 0;
  color: rgba(15, 23, 32, 0.7);
  line-height: 1.55;
}

.library-search {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 10px;
  align-items: center;
  min-height: 48px;
  padding: 0 15px;
  border: 1px solid rgba(15, 23, 32, 0.14);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 8px 24px rgba(15, 23, 32, 0.05);
}

.library-search span {
  color: #3f4d59;
  font-size: 1.35rem;
}

.library-search input {
  min-width: 0;
  width: 100%;
  color: #17212b;
  background: transparent;
  border: 0;
  outline: none;
  font: inherit;
}

.library-results {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 300px));
  gap: 18px;
  min-height: 430px;
  align-items: start;
}

.library-document-card {
  display: flex;
  min-height: 430px;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid rgba(15, 23, 32, 0.11);
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 16px 38px rgba(15, 23, 32, 0.08);
}

.library-document-card[hidden],
.contribution-panel[hidden] {
  display: none;
}

.library-document-media {
  position: relative;
  width: 100%;
  min-height: 0;
  aspect-ratio: 16 / 10;
  padding: 0;
  overflow: hidden;
  background: #062b53;
  border: 0;
  cursor: zoom-in;
}

.library-document-media img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  transition: transform 0.35s ease;
}

.library-document-card:hover .library-document-media img {
  transform: scale(1.018);
}

/* Diagramas verticales (p. ej. 1500x2000). Con `cover` la caja 16/10 los
   recorta y solo se ve un fragmento muy ampliado; el usuario percibe la
   imagen "enorme". Con `contain` la miniatura muestra el diagrama COMPLETO
   y pequeño, que es lo que se espera de una vista previa. El detalle se
   lee al abrirlo con "Ver ejemplo". */
.library-document-media.is-tall {
  aspect-ratio: 4 / 3;
  background: #eef2f6;
  cursor: zoom-in;
}

.library-document-media.is-tall img {
  object-fit: contain;
  padding: 10px;
}

.library-document-card:hover .library-document-media.is-tall img {
  transform: scale(1.012);
}

.library-example-badge {
  position: absolute;
  top: 14px;
  right: 14px;
  padding: 7px 11px;
  color: #071014;
  background: var(--green);
  border-radius: 999px;
  box-shadow: 0 8px 20px rgba(7, 16, 20, 0.24);
  font-size: 0.7rem;
  font-weight: 950;
  letter-spacing: 0.08em;
}

.library-document-body {
  display: flex;
  min-height: 225px;
  flex: 1;
  flex-direction: column;
  padding: 18px;
}

.library-document-body h2 {
  margin: 0 0 8px;
  color: #0b1117;
  font-size: 1.15rem;
  line-height: 1.1;
}

.library-document-body p {
  margin: 0;
  color: rgba(15, 23, 32, 0.7);
  line-height: 1.48;
  font-size: 0.9rem;
}

.library-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0;
}

.library-tag {
  padding: 7px 11px;
  color: #344451;
  background: #eaf0f2;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 800;
}

.library-document-actions {
  display: flex;
  gap: 10px;
  margin-top: auto;
  flex-wrap: wrap;
}

.library-document-action {
  width: 100%;
  margin-top: auto;
}

.library-document-actions .library-document-action {
  flex: 1 1 160px;
  margin-top: 0;
}

/* Descarga: secundaria frente a "Ver diagrama", pero claramente pulsable. */
.library-document-download {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 0 16px;
  color: #2f6a08;
  background: #f2f8ec;
  border: 1px solid #cfe3bb;
  text-decoration: none;
}

.library-document-download:hover {
  background: #e7f2db;
  border-color: #a9cf86;
}

.example-viewer-actions {
  display: flex;
  justify-content: flex-start;
  padding: 4px 22px 20px;
}

@media (max-width: 520px) {
  .library-document-actions .library-document-action,
  .library-document-download {
    flex: 1 1 100%;
    justify-content: center;
  }
}

.library-empty {
  display: grid;
  place-items: center;
  min-height: 390px;
  padding: 40px;
  text-align: center;
  border: 1px dashed rgba(15, 23, 32, 0.18);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.66);
}

.library-empty[hidden] {
  display: none;
}

.library-empty > span {
  font-size: 2.5rem;
}

.library-empty h2 {
  margin: 10px 0 4px;
}

.library-empty p {
  margin: 0;
  color: rgba(15, 23, 32, 0.66);
}

.contribution-invite {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 26px;
  align-items: center;
  margin-top: 34px;
  padding: clamp(26px, 4vw, 42px);
  border: 1px solid rgba(126, 211, 33, 0.3);
  border-radius: 11px;
  background:
    radial-gradient(circle at 90% 0%, rgba(126, 211, 33, 0.18), transparent 38%),
    #fff;
  box-shadow: 0 15px 34px rgba(15, 23, 32, 0.07);
}

.contribution-invite h2 {
  max-width: 780px;
  margin: 0;
  font-size: clamp(1.25rem, 2.2vw, 1.8rem);
  line-height: 1.3;
}

.contribution-panel {
  scroll-margin-top: 112px;
  margin-top: 24px;
  padding: clamp(24px, 4vw, 42px);
  border: 1px solid rgba(15, 23, 32, 0.12);
  border-radius: 11px;
  background: #fff;
  box-shadow: 0 16px 38px rgba(15, 23, 32, 0.08);
}

.contribution-heading {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 26px;
}

.contribution-heading h2 {
  margin: 0;
  font-size: clamp(1.5rem, 2.5vw, 2.1rem);
}

.contribution-heading p:not(.section-kicker) {
  max-width: 720px;
  margin: 9px 0 0;
  color: rgba(15, 23, 32, 0.67);
  line-height: 1.5;
}

.contribution-close,
.example-viewer-head button {
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  color: #28343e;
  background: #edf2f3;
  border: 0;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.5rem;
}

.contribution-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.form-field {
  display: grid;
  gap: 8px;
}

.form-field > span,
.form-field-wide > span {
  color: #1d2730;
  font-size: 0.84rem;
  font-weight: 850;
}

.form-field input,
.form-field textarea {
  width: 100%;
  padding: 12px 13px;
  color: #14202a;
  background: #fbfcfc;
  border: 1px solid rgba(15, 23, 32, 0.16);
  border-radius: 7px;
  outline: none;
  font: inherit;
}

.form-field input:focus,
.form-field textarea:focus {
  border-color: rgba(79, 158, 14, 0.72);
  box-shadow: 0 0 0 3px rgba(126, 211, 33, 0.14);
}

.form-field input[readonly] {
  color: rgba(15, 23, 32, 0.62);
  background: #eef2f3;
}

.form-field-wide {
  grid-column: 1 / -1;
}

.file-picker {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: center;
  min-height: 54px;
  margin-top: 8px;
  padding: 8px;
  border: 1px dashed rgba(15, 23, 32, 0.24);
  border-radius: 8px;
  cursor: pointer;
}

.file-picker input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.file-picker strong {
  padding: 10px 14px;
  color: #18310a;
  background: rgba(126, 211, 33, 0.2);
  border-radius: 6px;
  font-size: 0.82rem;
}

.file-picker span {
  min-width: 0;
  overflow: hidden;
  color: rgba(15, 23, 32, 0.65);
  font-size: 0.84rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.form-field small {
  color: rgba(15, 23, 32, 0.58);
}

.rights-field {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: start;
  color: rgba(15, 23, 32, 0.76);
  font-size: 0.86rem;
  line-height: 1.5;
}

.rights-field input {
  width: 18px;
  height: 18px;
  margin-top: 2px;
  accent-color: var(--green-2);
}

.form-honeypot {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.form-status {
  min-height: 22px;
  font-size: 0.88rem;
  font-weight: 750;
}

.form-status.is-error {
  color: #b42318;
}

.form-status.is-success {
  color: #2f7d0a;
}

.contribution-submit:disabled {
  cursor: wait;
  opacity: 0.62;
}

.example-viewer {
  width: min(980px, calc(100vw - 36px));
  max-height: calc(100vh - 36px);
  padding: 0;
  overflow: auto;
  border: 0;
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 28px 90px rgba(0, 0, 0, 0.34);
}

.example-viewer::backdrop {
  background: rgba(2, 8, 12, 0.78);
  backdrop-filter: blur(3px);
}

.example-viewer-head {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
  padding: 20px 22px;
}

.example-viewer-head span {
  color: #4f9e0e;
  font-size: 0.72rem;
  font-weight: 950;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.example-viewer-head h2 {
  margin: 3px 0 0;
  font-size: 1.35rem;
}

.example-viewer > img {
  width: 100%;
  max-height: 590px;
  display: block;
  object-fit: contain;
  background: #eaf0f2;
}

.example-viewer > p {
  margin: 0;
  padding: 20px 22px 12px;
  color: rgba(15, 23, 32, 0.72);
  line-height: 1.55;
}

.example-disclaimer {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 10px;
  align-items: center;
  margin: 0 22px 22px;
  padding: 13px;
  color: #6f4e00;
  background: #fff8df;
  border: 1px solid #f0d98b;
  border-radius: 8px;
  font-size: 0.82rem;
}

.example-disclaimer strong {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border: 1px solid currentColor;
  border-radius: 50%;
}

@media (max-width: 1050px) {
  .engineering-page .main-nav {
    display: none;
  }

  .engineering-page .site-header {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .library-layout {
    grid-template-columns: 1fr;
  }

  .library-sidebar {
    position: static;
    padding: 0 0 18px;
    border-right: 0;
    border-bottom: 1px solid rgba(15, 23, 32, 0.1);
  }

  .library-category-nav {
    grid-template-columns: repeat(4, minmax(150px, 1fr));
    overflow-x: auto;
    overscroll-behavior-inline: contain;
    padding-bottom: 4px;
  }

  .library-filter-panel {
    margin-top: 18px;
    padding-top: 16px;
  }

  .library-filter-list {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 20px;
  }
}

@media (max-width: 780px) {
  .library-hero,
  .contribution-invite {
    grid-template-columns: 1fr;
  }

  .library-document-media {
    min-height: 0;
  }

  .contribution-invite .btn {
    justify-self: start;
  }
}

@media (max-width: 640px) {
  .engineering-page .site-header {
    padding: 10px 14px;
  }

  .engineering-page .brand-logo {
    max-width: 190px;
    height: 52px;
  }

  .engineering-page-main {
    padding: 20px 0 48px;
  }

  .library-category-nav {
    grid-template-columns: repeat(4, minmax(172px, 1fr));
  }

  .library-hero {
    gap: 18px;
  }

  .library-document-media {
    min-height: 0;
  }

  .library-document-body {
    padding: 18px;
  }

  .library-results {
    grid-template-columns: minmax(0, 1fr);
  }

  .contribution-form {
    grid-template-columns: 1fr;
  }

  .form-field-wide {
    grid-column: auto;
  }

  .file-picker {
    grid-template-columns: 1fr;
  }

  .contribution-invite,
  .contribution-panel {
    padding: 24px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .library-document-media img {
    transition: none;
  }
}